Fujitsu Series 3 Manual

 
4. LIN Interface (Ver. 2.1) Operations 
 
4.  LIN Interface (Ver. 2.1) Operations 
The LIN interface (ver. 2.1) performs bi-directional LIN communication of master and slave. 
  Master mode operations 
  Selecting master mode 
To operate the LIN interface as a master, set the SCR:MS bit to 0. 
  Break field transmission-sy nc field transmission 
  The break field length (ESCR:LBL1, LBL0) and the break field delimiter length (ESCR:DEL1, DEL0) 
can be selected. 
   If transmission is enabled...

 
4. LIN Interface (Ver. 2.1) Operations 
 
  Sync field transmission- ID field transmission 
  When the first bit of the sync field (0x55) is transm itted, the SSR:TDRE (transmit data empty) bit is set 
to 1. 
If transmit interrupts are enabled (SCR:TIE = 1) during this time, a transmit interrupt occurs. 
   If a transmit interrupt occurs, the ID field can  be written to the Transmit Data Register (TDR). 
   If a receive interrupt occurs, compare the received data  with the transmit data to make...

 
4. LIN Interface (Ver. 2.1) Operations 
 
Figure 4-3 ID field transmission-DATA field reception 
LIN bus
Data field receptionID field transmission
Data reading of 
Data field
SSR:TDRE
Sync Field
SSR:RDRF
 
 
    The LIN interface (Ve r

. 2.1) in
 cludes noise filter (with the majority value applied after sampling serial 
data input three times with the bus clock). However,  design the board so as not to allow noise to pass 
through this filter or perform communications so  that any noise that has...

 
4. LIN Interface (Ver. 2.1) Operations 
 
Figure 4-5 LIN bus timing (when DATA field is received and FIFO is not used) 
SCR:LBR
LIN bus 
Data writing in TDR
TDR
TIE
RIE,TXE
RDRF(RIRQ)
Start of LIN break
Data writing in Sync field 
(0x55)
A transmit interrupt occurred.: 
The ID field is set. TIE is cleared.
Break field Sync Field ID Fi eld Data field reception
TDRE
SCR:TBIE
  Sync Field(0x55)                 ID Field                                    
A receive interrupt occurred.: The Data is read....

 
4. LIN Interface (Ver. 2.1) Operations 
 
Figure 4-7 LIN bus timing (when DATA field is received and FIFO is used) 
 
Receive FBYTE (display) Receive FBYTE (setting)
SCR:LBR
LIN bus 
Data writing in FIFO
TDR
Transmit FBYTE
TXE
RDRF(RIRQ)
Start of LIN break
A transmit interrupt 
occurred.: Transmit 
FIFO is written. Break field Sync Field ID Field Data field reception
TIRQ
Sync Field (0x55)      
ID Field                     
FDRQ
1
FTIE
3
A receive interrupt 
occurred.: FIFO is read.
RXE TIE
TIE
RIE
A...

 
4. LIN Interface (Ver. 2.1) Operations 
 
  Slave mode operations 
  Selecting slave mode 
To operate the LIN interface as a sl ave, set the SCR:MS bit to 1. 
 Break field reception-sy nc field reception 
1. If the break field is input, the break field is  detected (SSR:LBD = 1) at the 11th bit. 
If the ESCR:LBIE bit is set to 1 then, a receive interrupt occurs. 
2.  Enable ICU interrupts then to detect both edges. 
3.  The LIN interface (ver. 2.1), u pon the detection of the first falling edge  in...

 
4. LIN Interface (Ver. 2.1) Operations 
 
  ID field reception-DATA fi eld transmission/reception 
After reception of the ID field,  whether to transmit or to receive the DATA field can be selected. 
(To transmit the DATA field)  After reception of the ID field, wr ite data to the Transmit Data Register (TDR). Enable transmit interrupts 
(SCR:TIE = 1) during this time. 
Figure 4-9 ID field reception-DATA field transmission 
LIN bus
Data field transmissionID field reception
Data reading 
from RDR...

 
4. LIN Interface (Ver. 2.1) Operations 
 
  Slave mode operation timing chart 
Figure 4-11 LIN bus timing (when DATA field is transmitted and FIFO is not used) 
LSYN (ICU input) LIN bus 
ICU(IRQ) RXE
TIE
TXE
RDRF(RIRQ)
A status interrupt occurred.:  LBD is cleared.
Transmit interrupt enabled (TIE=1)
Transmission enabled (TXE=1)
A transmit interrupt occurred.: The Data is set.
Baud rate setting
Receive interrupt enabled (RIE=1)
Receive enabled (RXE=1)
Break field Sync Field ID Field Data field...

 
4. LIN Interface (Ver. 2.1) Operations 
 
  If FIFO is used 
Figure 4-13 LIN bus timing (when DATA field is transmitted and FIFO is used) 
 
Data writing in transmit FIFO
Transmission enabled (TXE=1)
Receive FIFO disabled
Break field
Data writing in 
transmit FIFO
LSYN (ICU input) LIN bus 
ICU(IRQ)RXE
TIE
TXE
RDRF(RIRQ) A status interrupt occurred.:  LBD is cleared.
Baud rate setting
Receive interrupt enabled (RIE=1)
Receive enabled (RXE=1) Sync Field ID Field
Data field transmission
LBIE LBD
RIE...

 
4. LIN Interface (Ver. 2.1) Operations 
 
Figure 4-14 LIN bus timing (when DATA field is received and FIFO is used) 
 
Reading from receive data
Receive FIFO enabledReading from 
receive FIFO
Break field
Data reading from 
receive FIFO LSYN (ICU input) LIN bus 
ICU(IRQ)RXE
TIE
TXE
RDRF(RIRQ) A status interrupt occurred.:  LBD is cleared.
Baud rate setting
Receive interrupt enabled (RIE=1)
Receive enabled (RXE=1) Sync Field ID Field
Data field reception
LBIE LBD
RIE
TDRE(TIRQ)
IRQ(ICU)
IRQ is cleared....